/*
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is
 *
 * java-concurrency-presentation:
 * concurrency presentation tutorial.
 *
 * The Initial Developer of the Original Code is
 * Marco Antonio Villalobos, Jr.
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s): None.
 *
 * ***** END LICENSE BLOCK *****
 */

package presentation.concurrency.slides;

import java.security.SecureRandom;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.CountDownLatch;

/**
 * Provides an example on how to use the array blocking queue.
 */
public class BlockingQueue {
    public static void main() {
        final ArrayBlockingQueue<Integer> blockingQueue = new ArrayBlockingQueue<Integer>(1000);
        final SecureRandom random = new SecureRandom();
        final CountDownLatch latch = new CountDownLatch(1000*1000);

        Thread producer = new Thread() {
            public void run() {
                try {
                    while (!Thread.currentThread().isInterrupted()) {
                        blockingQueue.put(random.nextInt());
                        latch.countDown();
                    }
                } catch (InterruptedException e) {
                    // allow thread to exit loop                    
                }
            }
        };
        producer.start();

        Thread consumer = new Thread() {
            public void run() {
                try {
                    while (!Thread.currentThread().isInterrupted()) {
                        Integer current = blockingQueue.take();
                        // ... do something
                        latch.countDown();
                    }
                } catch (InterruptedException e) {
                    // allow thread to exit loop
                }
            }
        };
        consumer.start();

        try {
            latch.await();
        } catch (InterruptedException e) {
            //allow exit
        }
        producer.interrupt();
        consumer.interrupt();
    }
}
